Unidad 1

A heart attack, also known as a myocardial infarction, occurs when the blood flow to a part of the heart muscle is blocked for an extended period, causing damage or death to the heart tissue. This blockage is typically caused by a buildup of fatty substances in the coronary arteries, which can burst and form a blood clot. Symptoms of a heart attack include chest pain or discomfort, shortness of breath, nausea, lightheadedness, and pain or discomfort in the arms, back, neck, or jaw. Immediate medical attention is crucial to restore blood flow and minimize heart damage. Treatment may involve medications, lifestyle changes, and procedures such as angioplasty or surgery to improve blood flow to the heart.

Seafood encompasses a vast array of edible aquatic animals and plants harvested from freshwater and saltwater sources. This diverse category includes fish, such as salmon and tuna, as well as shellfish like shrimp and lobster, and mollusks such as clams and oysters. Additionally, seafood encompasses other marine delicacies like octopus, scallops, and various types of seaweed. Seafood is prized for its wide range of flavors, textures, and nutritional benefits. Rich in protein, vitamins, minerals, and omega-3 fatty acids, seafood is enjoyed in cuisines worldwide for its versatility and culinary appeal. Whether grilled, baked, fried, or served raw, seafood offers a delectable dining experience that celebrates the bounty of the sea.

A bookshelf is a piece of furniture designed to hold and organize books. It typically consists of horizontal shelves that can be fixed or adjustable, allowing for the storage of books in various sizes and formats. Bookshelves can be standalone units or part of a larger system of storage furniture. They are used in homes, offices, libraries, and other spaces where books and other reading materials are kept. In addition to books, bookshelves may also be used to display decorative items, photographs, or other objects.

Junk food refers to food items that are typically high in calories, sugar, salt, and unhealthy fats, but low in nutritional value. These foods are often highly processed and include items such as candy, chips, soda, fast food, and certain baked goods like cookies and doughnuts. Junk food is popular for its convenience, taste, and affordability, but regular consumption can lead to health issues such as obesity, heart disease, diabetes, and other chronic conditions.

Headphones are a device used for listening to audio privately. They consist of two small speakers worn over or in the ears, connected by a band or frame that rests on the head. Headphones come in various styles, such as over-ear, on-ear, or in-ear, and can be wired or wireless. They are used for personal listening to music, podcasts, or other audio content without disturbing others. Some headphones also include features like noise-cancellation, built-in microphones, and controls for adjusting volume or managing calls.

A textbook is a comprehensive book used for educational purposes, providing detailed information on a specific subject or field of study. It is designed to support learning by offering structured content, explanations, and examples that align with a curriculum or course. Textbooks often include features such as chapters, exercises, summaries, and review questions to help students understand and apply the material. They are commonly used in schools, colleges, and universities to assist in teaching and help students learn in different subjects.

A text message is a short written communication sent from one phone to another. It typically consists of simple text, though it can also include emojis or links. Text messages are usually sent through SMS (Short Message Service) or MMS (Multimedia Messaging Service), allowing users to send information quickly and efficiently. Text messaging is popular for both personal and business communication, as it is fast, convenient, and does not require the recipient to be available for a phone call. Many mobile phones and messaging apps also allow group texting, enabling multiple people to receive and reply to messages.

A fire alarm is a safety device designed to detect smoke, heat, or fire and alert people to evacuate or take action. It typically includes sensors that detect signs of fire and a loud alarm to warn those nearby. Fire alarms are commonly found in homes, offices, and public buildings. Some systems are connected to fire departments or monitoring services, allowing for immediate assistance if necessary. Fire alarms are essential for providing early warning in case of a fire, helping to prevent injuries and damage. Regular testing and maintenance ensure they remain effective.

A sleeping pill is a type of medication used to help cause sleep or improve sleep quality in individuals experiencing insomnia or other sleep disorders. These medications work by affecting the brain and nervous system to promote relaxation and drowsiness.

Air conditioning is a system that cools and controls the temperature inside a house, car, or other enclosed space. It works by removing heat and moisture from the air, making the environment more comfortable, especially in hot weather. The system usually includes a compressor, a cooling unit, and fans that help distribute the cooled air. Some air conditioning systems also have heating functions, allowing them to regulate temperature year-round. They improve air quality by filtering dust and humidity, making indoor spaces more pleasant and easier to breathe in.

The origin of the idiom "strike gold" can be traced back to the gold rush era in the United States during the 19th century when people searched for gold and struck it rich when they found it. This expression is now used more broadly to describe any fortunate discovery or success.

Homework refers to assignments or tasks given to students by teachers to complete outside of regular class time. It is designed to help reinforce lessons, practice skills, or prepare for upcoming topics. Homework can include reading, writing, problem-solving, or projects that students work on independently or with minimal guidance. It provides an opportunity for students to review and apply what they have learned in class and is often used to assess their understanding and progress. Completing homework is an important part of the learning process and helps build responsibility and time-management skills.